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web/agent/skills/lean-build/SKILL.md

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+---
+description: "Build feature work with high overbuilding risk. Use for new behavior, product slices, or integrations where repository reuse, strict scope, and an explicit stop condition matter."
+---
+# Lean build
+
+Native Core's architecture-first simplicity remains mandatory. Turn feature into complete narrow outcome fitting system.
+
+- Derive observable acceptance and explicit non-goals from request and repository.
+- Trace entry point through layers owning invariants.
+- Deliver coherent end-to-end path across responsible layers; never force work into one file, direct expression, or local patch.
+- Reuse fitting seam. Refactor when patching duplicates behavior, weakens ownership, or hides root cause.
+- Omit modes, providers, config, extensibility, and polish unless acceptance needs them.
+- Add surface, dependency, service, config, or migration only for lifecycle design or acceptance; state material tradeoff.
+- Keep work runnable; preserve Core safety.
+
+Exercise path. Run focused proof. Stop when acceptance passes. Report only material omissions and trigger.

web/agent/skills/lean-build/agents/openai.yaml

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+interface:
+  display_name: "Lean Build"
+  short_description: "Build smallest coherent feature slice"
+  default_prompt: "Use $lean-build to implement this feature without speculative scope."